OnOpening for the ComboBox(string) fires off when ever the widget is clicked not just when opening

The Combo box (String)'s On Opening event fires off whenever the user clicks the combo box. This means that the opening event will fire off on closing as well as opening.

1. Open Editor
2. Create a New Widget Blueprint
3. Add a combo box (string) to the designer tab
4. Add a new OnOpening event to the event graph
5. Connect a print string to the OnOpening event
6. Add a few elements to the combo box (to make it easier to tell that it's open)
7. Compile and Save
8. Open the Level blueprint
9. Add the New widget blueprint to the viewport
10. Play in the Editor
11. Press Shift+F1 to show mouse
12. Click the Combo Box a few times
13. Notice that the Print string is being printed on every click and not just when the combo box is opening

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